D. Wisteria Lane is the director of the TV play Desperate Housewives

B

　　You may find yourself wondering: do blind people dream? Dream sleep is generated deep within the brain. As it is a function of the brain, and not the eyes, blind people dream as much as a sighted person would. It is interesting that the timing of the blindness in life may in fact influence the content of the dreams, however.

　　Research has evaluated the sensory experiences of blind people while dreaming for decades. These findings have been interpreted (解释) within the context of sighted people's experience of dreams. It is useful to consider the content of all dreams to better understand where it differs among the blind.

　　Most dreams contain features that are both visual and kinesthetic (related to movement, such as falling). More than half of dreams contain a sound. It is rare for people to describe other sensory experiences, such as those related to smell, taste, and pain. It is estimated that these latter three elements occur in less than 1 percent of dream reports. Interestingly, women more often experience smell and taste in their dreams while men more often report sound and pain.

　　Blind people are more likely to report feelings of touch, taste, and smell in their dreams compared to sighted people. This likely corresponds to their waking experience which relies more on these senses. They do not have dramatic differences in dream content, except that they seem to have less aggression in their dreams.

　　Despite these subtle differences in dream content, can blind people see when they dream? Some blind people actually can see in dreams, but it depends on when they lost their vision. Individuals who are born blind or those who become blind at a young age (typically by the age of 4 or 5 years) do not have visual imagery in their dreams. On the other hand, those who become blind after 5 or 6 years of age are able to see in their dreams. Therefore, there seems to be a window in the development of the brain in which the capacity to have visual dreams is established.

24. Why do the blind people also have the ability of dreaming?

　A. Because they learn the ability after birth.

B. Because the ability is controlled by brain.